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Summary of Significant Accounting Policies (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]      
Foreign currency translation, Beginning balance $ (70,296) $ (45,603)  
Foreign currency translation, Other comprehensive income (loss) before reclassifications 2,401 (24,693)  
Other comprehensive income (loss), Foreign currency transaction and translation adjustment, net of tax 2,401 (24,693)  
Foreign currency translation, Ending balance (67,895) (70,296) $ (45,603)
Unrealized gain (loss) on hedging activities, Beginning balance 390 1  
Unrealized gain (loss) on derivatives, Other comprehensive income (loss) before reclassifications (572) (671)  
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss 164 1,060  
Unrealized gain (loss) on derivatives, Net other comprehensive loss, net of tax (408) 389 112
Unrealized gain (loss) on hedging activities, Ending balance (18) 390 1
Benefit plan liability, Beginning balance 84 129  
Benefit plan liability, Other comprehensive loss before reclassifications   (45)  
Benefit plan liability, Amounts reclassified from accumulated other comprehensive loss (84)    
Benefit plan liability, Other comprehensive income (loss) (84) (45) 141
Benefit plan liability, Ending balance   84 129
Accumulated other comprehensive income (loss), Beginning balance (69,822) (45,473)  
Total, Other comprehensive loss before reclassifications 1,829 (25,409)  
Total, Amounts reclassified from accumulated other comprehensive loss 80 1,060  
Total, Net other comprehensive loss, net of tax 1,909 (24,349)  
Accumulated other comprehensive income (loss), Ending balance $ (67,913) $ (69,822) $ (45,473)